CONTROL GATES AND VALVES
First Claim
1. An overshot control gate for use with a trapezoidal irrigation channel, said gate having a rigid rectangular section adapted to, in use, be pivotally mounted to a base of said trapezoidal irrigation channel, a pair of triangular sections pivotally mounted on opposite sides of said rigid rectangular section, each of said triangular sections being divided into first and second triangular sections with a common apex at said base of said trapezoidal irrigation channel, each of said first triangular sections being rigid and adapted to, in use, be pivotally mounted to opposite side walls of said trapezoidal irrigation channel, and each of said second triangular sections including said pivotal mounting on said opposite sides of said rigid rectangular section and being formed of a flexible material.
1 Assignment
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Accused Products
Abstract
The invention discloses an overshot control gate for use with trapezoidal irrigation channels. A gate has a rigid rectangular section adapted to, in use, be pivotally mounted to a base of a trapezoidal irrigation channel. A pair of triangular sections are pivotally mounted on opposite sides of the rigid rectangular section. Each of the triangular sections are divided into first and second triangular sections with a common apex at the base of the trapezoidal irrigation channel. Each of the first triangular sections are rigid and adapted to, in use, be pivotally mounted to opposite side walls of the trapezoidal irrigation channel. Each of the second triangular sections including the pivotal mounting on opposite sides of the rigid rectangular section are formed of a flexible material. Also disclosed is a pipe flow meter and a duckbill valve.
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Citations
20 Claims
- 1. An overshot control gate for use with a trapezoidal irrigation channel, said gate having a rigid rectangular section adapted to, in use, be pivotally mounted to a base of said trapezoidal irrigation channel, a pair of triangular sections pivotally mounted on opposite sides of said rigid rectangular section, each of said triangular sections being divided into first and second triangular sections with a common apex at said base of said trapezoidal irrigation channel, each of said first triangular sections being rigid and adapted to, in use, be pivotally mounted to opposite side walls of said trapezoidal irrigation channel, and each of said second triangular sections including said pivotal mounting on said opposite sides of said rigid rectangular section and being formed of a flexible material.
- 5. A pipe flow meter including a pipe section through which liquid flows, said pipe section at one end adapted to be connected to a pipe containing said liquid, said pipe section having at least one pair of flow sensors for detecting flow rate of said liquid through said pipe section, said at least one pair of flow sensors being located on at least one substantially horizontal plane, and a duckbill valve at the other end of said pipe section adjacent to said at least one pair of flow sensors, said duckbill valve having its opening oriented on a substantially vertical plane.
- 9. A duckbill valve including a sleeve of flexible material having at one end a wide opening adapted to, in use, be coupled to a source of liquid to be controlled and said sleeve tapering to a narrow linear mouth forming a normally closed opening at the other end through which liquid can exit from the valve, a first frame adapted to be coupled to said valve, said frame being external to said sleeve and having a ring adapted to co-operate with said wide opening of said sleeve and a set of four struts equispaced around and pivotally attached to said ring at one end of respective struts, said struts being pivotally attached at the other end of respective struts to respective mounting points located midway and at opposing ends of said narrow linear mouth to prevent collapsing of said sleeve.
- 13. A flexible pipe valve for controlling low pressure hydraulic networks, said valve including a flexible pipe member adapted to, in use, be connected to an entry or exit end of a pipe through which liquid is to flow, said valve having a lifting ring at its end opposite the connection to the entry or exit end of said pipe, said lifting ring being coupled to an actuator for raising and lowering said flexible pipe member above a surface level or static head of said liquid.
- 19. A duckbill valve including a sleeve of flexible material having at one end a wide opening adapted to, in use, be coupled to a source of liquid to be controlled and said sleeve tapering to a narrow linear mouth forming a normally closed opening at the other end through which liquid can exit from the valve, a first frame adapted to be coupled to said valve, said frame being external to said sleeve and having a ring adapted to co-operate with said wide opening of said sleeve and a pair of struts pivotally attached to said ring at one end of respective struts, said struts being pivotally attached at the other end of respective struts to respective mounting points located midway and on opposite sides of said narrow linear mouth to prevent collapsing of said sleeve.
Specification